If you are paying to have all the work done and you want to avoid heavy mods to the car then you should consider the keep the poly advice. The money saved on the blueprint will be big $$ to get the rest of the car sorted out. Your total $$ will be much lower modding the poly (stroker even) or waiting until a prebuilt car comes available with what you want. Good shops are very expensive. Cheap shops are even more expensive but you don’t realize it up front.
